用opencv写的人脸识别程序，从usb摄像头读取每帧图像，并且识别出图像中的正脸，程序是照着官网上写的，代码比较规范，可以作为2次开发使用-Written with opencv face recognition program, each frame is read from the usb camera, and recognize the positive face in the image, the program is written according to the official website of the code is fairly standard, can be used as development